you would ALWAYS want to nail up the LV box on the opposite STUD in the same cavity!!!!!!! not the opposite side of the stud. this allows a flush enclosure style box like the snap 8x14, chief PAC, AI, etc to be cut in and have your LV and power in the same enclosure. also we NEVER nail any box on other side of a single stud PERIOD. it looks like shit that close together. my guys have to nail up at least one block to space it out.