Here's a way to get there in 4RU and under $7k total, with a consistent aesthetic.
Mains amp: ElectroVoice CPS-8.5. Has a fan, but it's a lot quieter than the Berry EP2500 or Peavey IPR line. 250x8 into 8Ω, 500x8 into 4Ω, with any channel pair bridgeable to 1000W/4-8Ω.
Sub amp: ElectroVoice CPS-4.10. Basically the same amp as above, except half the channels with the same aggregate output (500x4/8Ω, 1000x4/4Ω, 2000x4/4-8Ω bridged).
Both have 12V triggers, too. With selectable turn-on delays. They're expensive, but I would expect that they have much higher labor costs than many others (EV is a division of Bosch, and these are marked "made in Germany.")
While I've only seen the CPS 4.10, I use the 8.5 to drive my multisub system, and it just works. No fuss, no drama, just sound. It's in the same room as the system, about 14' from the listening position.
Other brands to look at for big power in a small package are Powersoft, Camco, and Ashly. (Or Powersoft OEM'ed amps, such as the Klein+Hummel/Sennheiser rack amps.) Though to my knowledge none of those firms' amps have 12V triggers built in.
The only downside is that you'll have to cut apart your signal wires, because they have Phoenix terminal inputs rather than RCA. And read how to connect the wire, because to get full output you'll have to connect the shield and ground terminals together.
But regardless of what you pick, you should look for an amp with electrical safety approval from an OSHA-approved NRTL.
Sadly, proper safety approval (it's voluntary, not legally mandated) is fairly rare.