If you are in a power rack doing these just set the spot pins up about a foot off the floor. You can also do close grip benches on a bench, just stick your feet way out in front of the bench as if you were lying on the floor. Kind of like a floor press but not on the floor. Just don't arch or use leg drive, aka bench like a gym rat. Sure your elbows won't stop on the ground but that's not a problem.
If you have a barrel chest like me the bar touches my chest on a floor press anyways. Heavy board presses are an option. You do not need anyone to hold them for you either. make them like in the pic. Wear a loose belt of some kind and attach the caribiner to the belt and bench away. been doing this for years and I have yet to have a board fall off me. They may shift around as the going gets tough and I get sloppy form but that's entirely correctable.
I hate dips, never got much out of them other than tweaked pecs, hurt shoulders and cramped up upper backs. besides, banging 405 board presses for me was much cooler and more effective and a direct carryover to pressing movements.