Simplest idea would be to make the table lower than the bench and then make a spacer under each tool that lifts it up to the bench height. For example say you make the bench 36" tall, then make a small table that is 18" tall. Then measure the tool and maybe the miter saw is 6" tall, so you make a 12" box to mount it on so when it sits on the table its at 18". You can put a door or drawer on the front of the 12" box to make it storage for spare blades and other stuff. Then say maybe the table saw is 14" tall it will only need a 4" spacer under it.
Choose a size for the mount then check the manual or measure in the store nay new tools to make sure they fit within that size. Then you may someday have to prioritize your standard against the features of a new tool if it happens to not fit.
I have a small garage as well and have been trying to stay with smaller tools and keep them somewhat portable so I can sit them on the shelf. Did similar with my router table, made it a box that sits on the bench when I'm using it and sits on the shelf when I'm not,