If the impact socket and break over with cheater doesn't do the trick, or the bolt head is stripped, drill it out. Center punch the center of bolt head, or use a small bit to start. Then use a bolt the size of the bolt shank and drill slowly so you don't get it hot and harden the bolt. Use a shop vac to clean up the cuttings and no harm to safe. You may have to remove the shelving to get the room needed as you want to be straight over the top of the bolts. Head lamp will help with lighting.
There's a great idea.