2004 Rav4 (2)JL900/5 MiniDsp 8x12(Dirac) LPG26NA GS25 Epique180-44 (2)Um12
You’re using nice equipment there, not taking the proper time to thoroughly plan and implement it would be a shame. Hopefully your installer will test locations for the best possible response vs realistic mounting options. If I were in your shoes, I’d build 2 simple enclosures to test in the configurations you mentioned plus more if necessary. The opposing subs may create a cardioid effect, I believe is the right term, and be great. Or a more traditional rear facing arrangement may be better. For the level of equipment you have, spend on a few more on labor hours and have the installers nail the locations.