My kitchen does not need to pass inspection so I was also thinking I would skip the air gap. That would then be 4 things placed at the sink. What would be a good placement for those? It won't be symmetrical since the faucet will be centered. So, where should the soap dispenser, filter faucet and air switch go? What would look the best? Thanks again!

As far as rules, I did mine for what would work out and look good for me. I also made sure that the side faucet knob did not interfere with any of the other items. Here's a pic of left to right--Soap, faucet, airswitch, and hot/chilled water faucet: It has worked out great!!

I have the Waterstone Traditional PLP at my main sink (LOVE IT!) along with the hot/cold faucet and a a soap dispenser. I have a 36" sink and it isn't crowded at all. Plenty of room to add an air switch and another dispenser for lotion. I also bought an air switch for the garbage disposal but ended up not using it and stayed with the wall switch. My reason for doing that had to do with safety after watching my daughter playing with every button and knob when we were in at a store. It looked like something fun for her to play with. The wall switch doesn't give her temptation and it far enough away that she'd really have to work at it to get her hand down the disposal and flip the switch at the same time. I agree the switch is beautiful. At the island prep sink I added a switch under the counter for the disposal. The kids think that is pretty cool and showed it off to friends when the kitchen was first done, but now, out of sight out of mind. They don't touch it. I love my soap dispenser (the NeverMT is a must!) and use it a lot. I still have a bottle of dish soap on the counter and use it a lot too. It just depends on what I'm doing but I love having both. I tend to grab the bottle of soap (I keep it in a pretty olive oil dispenser) when I want soap in a specific place, like a pot or pan that I'm washing. I tend to use the built in dispenser when my hands are dirty or I want to pump some soap on my sponge. There are a lot of pretty dispensers out there if you want to keep soap on the counter. We don't use a separate hand soap and only use dish soap in the kitchen. I used to have a lotion dispenser in my previous kitchen and got so tired of people trying to wash dishes or their hands with lotion. I found people pumped first and asked questions later. And several times well meaning people added soap to my lotion dispenser. UGH!!! At least a NeverMT would stop that problem. But I found the lotion dispenser drove me nuts more than it helped. I'm just going to put out a pretty lotion dispenser in this kitchen. As far as mixing the Waterstone air switch and filtration faucet with another brand of kitchen faucet, it is just going to depend on what you pair it with. As long as they look good together, should be fine. It's totally going to depend on what finish you use and the quality of the other faucet, so hard to say.

I think I'm going to put my air switch to the right corner on my main sink. I'm thinking that way I might place a small trivet or decorative soap dish between the faucet and air switch to hold my soap bottle (I don't think I'm going to use a built-in soap dispenser either as I've had trouble on all three I've ever owned.) I'm hoping that means less gunk can build up around the air switch as well. On my island, I'm considering not having an air switch but just a regular switch under the sink. I've had those in the past and it'll help keep the island less cluttered. I've got to order my sinks soon 😬