I'm a retired electrical contractor and when we recently remodeled our kitchen, for uplighting, I used these 4' x 1' x 1" LED ETL listed fixtures from Costco that I connected using shallow 4-0 boxes and MC cable with Hardy Board where they rested on the wood. For the under counter puck lights, I glued four small spacers using high temperature silicone cooking mating material that I glued to them using Liquid Nails before using silicone to mount them to the wood. So far, no heat issues. I also installed a 1" wide by 8' long LED over our island which really set off things. It's not your normal type of lighting fixture and took a lot of searching to find it. I also did a lot of other fun stuff, like the cooktop vent and the oven that can be controlled by my phone so if I stop at Papa Murphy's, I can turn it on so it's hot when I get home.