Have you ever had a sink mounted soap dispenser? I ask because most people I know think it’s a good idea until they have to refill it. It’s a pain reaching behind the sink to unscrew it, sometimes requiring emptying the sink cabinet, then trying to not have the pump part drip, then holding down the top pump part from the top while you reach underneath with a bottle full of soap, trying to not spill it while you screw it back on. Maybe there are fancier ones now that are easier?

I dunno, Every soap dispenser I’ve ever owned refilled from the top. You pull the dispenser out and squeeze a ton of soap into the container right from the top of the sink. Easy Peezy. Have they changed them?

So you are not having an undermount sink then?

As far as refilling soap dispenser get a Never-MT dispenser kit. It hooks the soap dispenser right to a bottle of soap. I buy the large Dawn that they sell at Costco.

"I ask because most people I know think it’s a good idea until they have to refill it. It’s a pain reaching behind the sink to unscrew it, sometimes requiring emptying the sink cabinet"

What year are you in? Soap dispensers have been made to fill from the top for 20 years. They're not "fancier", that is how they are made. It takes a minute to fill them. Really, in my house 20 years ago, my in-counter soap dispenser filled from the top. And it's much better than the drippy sticky cloudy counter soap bottle that falls over when it gets below half-filled.

To the OP - I initially was going to recommend you install the soap dispenser with a hole in the countertop, not in the stainless steel edge. But editing this post after I thought it over - you want the dispenser pump stem to have reach into the sink. If the dispenser is installed too far from the sink edge, you might not be able to get a pan or dish under the soap dispenser to pump soap onto it, or the soap could drip on the counter rather than into the sink. So ensure that the hole for the soap dispenser is close enough to the sink edge that the pump has good reach into the sink.

Put the dispenser on the sink deck please. It won't budge.

Place it on the sink deck, on the stone can cause problems from soap. Remove the pump bottle, stick 1/4" plastic tubing onto the end of the pump stick (from under the sink). Cut the tubing (allowing enough length) and flip open the top of the giant size Dawn bottle and shove the tubing in, almost to the bottom. You can use a knife to widen the opening on the cap just a little bit if the tubing is hard to shove in. You will need to gently pump for a minute or so until the soap makes it's way up. You might need to replace the empty bottle in a few years. And while you're at it, position your faucet handle in front so you don't drip water on the counter every single time you use the handle.

For undermount sinks, it has to go on the stone, right?
First time ever with an undermount...

Stax - that guy in the video seems pretty inept, but I guess it still shows how easy it is to fill a soap dispenser even if you have shaky hands, no depth perception, and no ability to tell when to stop pouring lol (I was watching the video and saying to myself, “gee, he should stop pouring now...Now...NOW. Cringe”). I personally use a thinner dish soap than in the video because then I don’t get a gummy or stuck pump (I use Seventh Generation or Whole Foods 365 dish soap).

Thanks everyone! Although things went a little off topic here - yes I have had built-in a soap dispenser before (and I loved it), yes I know how to fill it (but thanks for the video!). The sink is a top mount not under mount, if it were under mount it would be no question - obviously install into the stone bench top.

To clarify, what’s the ‘deck’? I googled but found conflicting answers. I haven’t heard ‘deck’ in relation to sinks, I think we don’t use that term here (Australia) in this context, so not sure if it means the stone bench or the steel sink rim - kind of key to the answer, so please excuse my ignorance and the need to clarify!

Basically, will the steel bend over time or is this not a concern?