You'd need to have a tape loop or a line output on your receiver, but those would in theory work. Pyle's pretty junky though. https://www.amazon.com/gp/product/B08SL6ZL6Q?ref=ppx_pt2_dt_b_prod_image plus some used indoor/outdoor speakers off CL or FB Marketplace is what I'd do. https://www.bestbuy.com/site/yamaha-120w-outdoor-wall-mount-2-way-speakers-black/6328912.p?skuId=6328912 would be a decent option if you want to buy new, they've got solid low end response although they aren't super sensitive.

Find yourself a 3" thick cardboard box or cookbook (wrap it in a plastic bag!) sized like the subs you're looking at, shove it under the seats and see how feasible it is. FWIW this is the thinnest one I found and it ain't great. https://www.amazon.com/Rockville-SS8P-Under-Seat-Powered-Subwoofer/dp/B079PRCP9W?th=1

Marine and powersports audio are going to have a lot of what you're looking for. This sees a lot of use in custom home speaker builds: https://www.amazon.com/Kinter-K3118-2-1-Bluetooth-Amplifier-Subwoofer/dp/B08SL6ZL6Q You'd need a clean power supply, maybe even go battery with some 18650s wired to charge when the car is off.