Ferryden, by Montrose is a great launch site. I use it for most of my launches, see YouTube:
https://youtu.be/inlW-tjn2R0 for a good view of the beach, deep water at any state of tide. They built a new slip at Arbroath -STAY CLEAR, useless and now blocked off, my mate lost his wet suit booties in the mud at the end of the slip, it's very shallow for a long way out unless at top of the tide. Has now been blocked off for trailers.
Johnshaven and Gourdon have nice little harbours with slipways, if you're unlucky you may have to pay. A bit further north there is Caterline, car park at bottom of cliff road and easy access to water into small harbor. You'll see it here in one of Donny's vids from a trip with me and another pal.
https://youtu.be/UJKo2EZNXts