I remember weakly that you had shared a Facebook post regarding the number of turbah one can use. I think it was mentioned that one cannot use more than one turbah from the masjid at a time.
I’m unable to find that post. Can you kindly help me with the issue here and maybe point me to any reference book that has spoken about it?
Essentially if you don’t have permission you should use one turba in the mosque. The waqf on it is usually for Sajda not for support of sajda. Best to bring your own from home