I would also recommend looking at Directus (https://directus.io https://directus.io). We evaluated PayloadCMS to drive the backend of a mobile app and eventual

I would also recommend looking at Directus (https://directus.io https://directus.io). We evaluated PayloadCMS to drive the backend of a mobile app and eventually settled on Directus because it supported heterogeneous collections which was something we had to have. Directus also has a template for a multi-tenant app which sounds like something you might need.