It has some good reviews and its not very expensive. There are other models on amazon that have signal sensing capability so you wont need to run a remote 12v+ wire to it, just the battery, ground and line level inputs, the rockville 8" or 10" is one example.
You have a lot of room behind the seats and as mentioned, you will not be able to fill the low end of the frequency range with authority using an under seat setup.
You can easily fit a full size 8-10” sub or quality compact 12-13 with optimal enclosure. Even prefab, you can purchase and install a sub/amp/enclosure for the the similar price as one of those underwhelmeing 2-$300 under seat powered subs.