I moved my tom's fold and tumble rear seat further forward when I installed it. I did not like how far back it sat when using the latch bracket in the intended position. I drilled new holes and with the help of another person holding the bolts down from the top I was able to reach up underneath just above the front of the fuel tank to put the nuts and washers on. I did make a new latch bracket but the process should be the same for the included one. And for reference the Bronco that I installed it in has a 1" body lift and an Aerotank fuel tank, which I do have tucked up close to the floor.
Here's a post from my build thread of when I did the install.