Rockiezz - If you're a righty and you don't already have a crash cymbal over the floor tom(s) - then over the floor tom might be a good, easy to turn to spot on the kit. If you have a single rack tom, maybe between the rack tom and the floor tom (over the bass drum) is another easy to get to spot that puts your hands in good position to play them.
Have fun with them for all of us! That's a very cool vintage set of bongo's you found. Love the flat base stand too.
John