Agree with Kirk . The more Burl and grain swirl, the more unstable and should be sandwiched or stabilized. For risers and lams I only use straight grained wood. For fancy veneers, Burl is ok if solid or can be stabilized and then cut into veneers.
Or it can be ground slightly over thickness and glued to a lam of, like Bamboo and the then ground down to veneer thickness. Burl requires care to work with in any wood species due to the grain orientation.