Buy these 240V PDU's. They are brand-new, sealed, and come with a TON of HD-quality powercables (c13/c14). https://www.ebay.com/itm/382243077501

I bought four kits. 20A PDU de-rated to 16A. Each comes with L6-20P main power cables to go to the wall but I bough L6-30P cables instead to fit my plugs. I bolted them to the side rail of my muscle-rack's from Home Depot using the hardware the kits come with (90 degree brackets). I'll upload some photos soon.

Look into installing a Eaton Ultimate whole-house surge protector: http://a.co/iiVm9K5 (super cheap now! $95). Install it properly using a 50-Amp breaker to maximize the full rating of the surge protector. I have yet to install mine as I had to order a quad-tandem breaker to make room for two more slots in my panel.