This is the coolest one, but click the link to see the rest!
Nice to see that the caulk holds the anchors. You asked for ideas to hold the plywood down. Use the same caulk to glue down small skirt strips (or partial strips) on all 4 sides. That way you don’t mess up the wood your cutting and they are easy to remove
If your concrete is smooth you could just use double sided woodworking tape to secure the skirt. Would both give support for the sled and hold the plywood. The tape is pretty thin so would have minimal effect on sled angle. Or one could machine down the strips the thickness of the tape.
I think both of those ideas would work really well.
Someone in the KS comments told me about this stuff
I’ve ordered some to give it a try
Haven’t used that in a workshop environment, but have used it under rugs to prevent slipping on hardwood or concrete floors. It lost some effectiveness once it collected dust/dirt
I agree, I would expect the dust to be a problem but a bunch of folks have said that it’s fantastic for sanding and routing so I think it’s worth a shot