Grabby abusive employers will likely hate this and downvote...But, while I don't have any experience with separate NDAs, never given nor received (they've always been baked into contracts and never presented a problem, were always scoped and not grabby), yet back in the day I turned down over USD 250K in multiple contracts that had funky "grabby vague IP provisions", or "grabby excessive non-compete provisions" when I was contracting and the contracts related to side-projects. Probably doesn't sound like much, but it was a lot for global remote at the time.

Well, it all worked out well. The personal projects I was working on and protecting paid beyond that now...!! Hahah.