Power conditioners will only clean the power if it’s dirty. Have a licensed electrician do a power quality test and you’ll know how good (or bad) your power is. Regardless, a panel mounted TVSS is money well spent, as are decent quality TVSS-equipped power distribution units between the receptacles and equipment. If you are in need of brownout and blackout protection as well, don’t waste your money on a low-end UPS that puts out square wave power. Pony up the money for an online double-conversion UPS with true sine wave output. I use Eaton 9130 UPSs, which are commercial data center grade, but they have noisy cooling fans, so they’re located in the basement so my listening room is as quiet as a library.