One decision you’ll have to make is whether you want to run stereo or mono to the subs. If you have a SW, LFE or x.1 output from your preamp or DAC, you will be able to send the same signal to both subwoofers, which is the most effective way to tame low frequency room modes. If you don’t have that, you’ll need a processor like miniDSP, PC based sound card, or similar to create one. An alternative is to use the subwoofers as a stereo pair, effectively creating a three-way right and left speaker. If you’re only playing 2.0 stereo, this could be a pretty good option.
I would consider starting by measuring your room. You’ll have to have that information in order to generate the filters you would use for room correction anyway. Your speakers have some basic filters built into them, and depending on what you find when you measure your room, and what you decide your goals are, you might be able to get reasonable results just using the options you already have built into the speakers. That’d save you the cost of the miniDSP or similar processor.