Also have plans to implement Edge Chromium in our organization, but … not before Edge first start is fixed for policies to work (to not show any … flying-around things … not so enterprise-mode, don’t You think!), also new tab to appear properly empty (wo any … facebooks etc. links there, same reasons, not needed for ent, well, at least one should have option to choose).
But, maybe I’m wrong, seems to me for Edge start page does not work via policy, but used is (old) Edge home page value. Using latest stable version 79.0.309.71 and beta 80.0.361.40.