Remodelling a 60's home. Initially I was gonna replace the 2-gang faceplate+switch, with a similar face plate. So during backsplash installation I tiled accordingly, including installing a PVC Bullnose Tile Edging Trim in two pieces (above & below 2-gang box) to allow for the 2 gang faceplate to place over them. Later I thought to add a wifi switch for the front and back porch lights (both are 2-gang types.) The new touch wifi switches arrived and they are 1-gang form factor though they have two touch switches each. Looking for ideas on how to install and have a clean finish, short of having to break the tiles, the sheetrock...just to install a 1-gang box.

Secondly, how is the yellow thingy installed? They switches didn't come with instructions.

 

Three suggestions:

1. Install a blank cover plate with an opening cut out to accommodate the new switch and mount that on the faceplate. Allows use of cover plate that comes with the switch but will stick out a bit and may look odd.

2. Make a cutout in a blank cover plate for the touch areas and do not use the cover plate that came with the switch.

3. Install switch one side and cover the other side with a modified cover plate.

Some examples of "custom" plates I have made.



Center position modified.

Temporary while looking for a 3-gang plate to modify.

Timer on left, dimmer on right.

 

Here is a link for additional info...
https://www.amazon.com/dp/B0B5GQDN4X...t_details&th=1

 

Scroll down and click on for user guide. It shows capacitor connection and may explain in the details.

 

And here is the result

 

That works. If there is a small gap at the top or side to be covered, caulk will be better than grout. It can be smaller, smoothed and not crumble.