I have 3 bases mounted on the front of my boat. One in the middle and one on each side. I have a double seat mount I use if 2 of us are fishing and we use the bases on the sides. If I fish alone I use the middle mount. I took the front panel where the trim/trolling motor plug is off (to get my hand under the floor) and mounted the bases to the floor of the boat. I used 3 inch bolts and a lock washer to keep them from loosing up.