Ok, this might be a dumb question, but is there any reason I can not mount a fuel cell sideways (left to right, not on its side) on one side of my trunk?

Right now it is sitting right in the middle of my trunk, but there is plenty of room for me to swing it sideways and mount it off to one side, thereby freeing up the bulk of my trunk space.

I was just going to dump the cell, but the guy I got the car from tossed out the original tank, and even one from the classic car junkyard is $275.00, so I have to make do with what I have.
It would be nice to get a spare back in the trunk, and build a nice carpeted cover for the fuel cell so it does not look just stuck in there.

Thanks!