When I know there is going to be an issue like this I go with Origin Acoustic speakers (been using them more anyway). Their zip system in place of dog ears offer much more depth then regular dog ears. Had a job where someome decided 2 layers of 5/8" sheetrock and a 3/4" later was a good idea. Thankfully I knew ahead of time. Cutting them was not fun, but speaker install was a breeze.