rear brake install required VAGCOM?

I’ve got F&R replacement rotors and pads and in searching for a shop to do the work I’ve gotten mixed answers. I’ve had shops tell me they can do the job but I want to be sure they can do so correctly. Is it correct that to push the rear calipers back in a VAGCOM is required to release the rear pistons? I don’t want someone blowing up my calipers in bench vice or with a C-clamp.

Thanks!