Charge multiple iPad Pro 12.9

I'm looking for an in stock charger for multiple ipad pro (12.9). They will be on while charging, on a display, and I have 35 of them in a fairly small area. To date, we've not been able to source a reasonable charger for them which is compact, and supplies full power.

Does anyone know of a multi port USB C PD charger capable of charging 8+ at the same time (we could use multiple of these, we're just trying to avoid having a ton of standard 120v plugs).

The stuff from coolgear looks promising, but it has been backordered or out of stock for over a year.

Thanks in advance!