If you look at the Modern-Aire site, they have several shapes where the front tapers at the top to the depth of an upper cabinet, and the sides are straight so as to butt up to, and cover, the yellow cabinet sides you mentioned. Their typical sizes are 18" and 30" high, but you could get a 24" custom one if your budget allows. Or you could get an 18" and have a box made for above it to cover that area and to which you could attach replacement moulding. The box could be made of either wood matching your moulding or sheetrock. Vent-a-hood has a stainless direct replacement if you decide to stick with the same size you now have. I'm attaching the link to the Modern-Aire page that shows their shapes. PS-10, PS-11, and PS-26 all have the characteristics I was talking about above. Here is a link that might be useful: Modern-Aire Hoods

Welcome. You have stepped into a minefield, some of which I fear was planted by me. Here is the home of perfect is the enemy of good enough; good enough is the enemy of inexpensive. In my view, long before choosing a brand, one should determine requirements. I won't repeat the process here; you can find many examples by searching threads that I've commented on, as well as by others whose comments may be found in such threads. Some mine markers include: Need for make-up air (MUA), informal, formal passive, formal active Possible need to heat the MUA Need for sufficient capture area Need for sufficient volumetric flow rate <==> hood intake air velocity Need for operating within a range of duct velocities Fact that blower specified flow rate applies to hanging freely in the air, not within a system Relative merits of mesh vs. baffle filters Relative merits of "magic lung" squirrel cage impingement filtering vs. baffle filtering. Several threads, including recent ones, have references that should be of help.

It is actually desirable that the hood capture area be extend some distance from the wall, preferably more than 20 inches, such that it overlaps plumes generated from front burners as well as from back burners. Front-to-back limits due to sight lines to back burner pots need to be considered. An example is the Wolf Pro Low-profile hood that is 22-inches front-to-back, probably 20 inches of effective capture area. It is 10 inches high, so one might want to jack the cabinet over it a bit higher to get 30 to 36 inches of clearance. Spaced out 3 inches for a smooth transition to the cabinet doors one would have very good overlap in the forward direction.

@Valentina Lagana: "Yeah no help here no offense. People obviously don’t know. From what I was told, all vents can be recirculating." So you're saying that because you were "told" that "all vents can be recirculating" that the IKEA ÖMSINNAD can be recirculating even though the Product Details and Installation Guide make clear that this hood is only to be vented to the outside?