Get a LV bracket cutout template if you're hanging TVs and fishing cables up the wall from behind an entertainment center. Makes that shit way way more convenient to do.
Low Voltage Mounting Bracket Template https://www.amazon.com/dp/B07B4K4C26/ref=cm_sw_r_apan_i_8CC09SR3FGWMXNM8R2D5
For 13 bucks there’s a plastic template you can get if you don’t have a saw already. These are the next best thing.
Low Voltage Mounting Bracket... https://www.amazon.com/dp/B07B4K4C26?ref=ppx_pop_mob_ap_share