Pick any reputable company's 4-channel amplifier. You might want to focus on a small chassis and consider whether the cables attach all on one side or on opposing sides.
As these are 2 ohm speakers the total power output to consider is 300W-500W. What's an example? JL XD400/4v2. It's rated at 75W x 4 @ 4 ohms, 14.4V, which is a total of 300W RMS. The "400" in the model number comes from the 2 ohms rating of 100W x 4 @ 14.4V.
Zed Audio MIKRO IV - 400w RMS 4 Channel Class D Amplifier Zed Audio
store.soundsolutionsaudio.com
This would be a great amplifier for those speakers/great together. I have (2) of the 250.1s and they sound fantastic on my CDT set up in the doors when I dont run my Zed A/B amps. Compact as well. Just an option