You can buy painter pyramids
Or you can make your own. Waiting to try these out. Some scrap melamine MDF and a few biscuits
Keeps the project off the table and allows staining or finishing without sticking to the table top or paper. If the back side of something needs finishes and might not be super critical, you can do both sides at once. For example, put these in the hinge holes and pull/knob holes after you've put finish on the back, then do the front and edges.