How to stop back to back meetings Exchange /Outlook

So we are running Office 365 Outlook version 2205 (Build 15225.20356 Click to Run)

Exchange Online Hybrid Mode, 2016 ( I believe)

We would like to block users booking back to back meetings on a Room Resource.

We want a 15 minute Window between meetings. 

All I could find was this article about meeting meetings shorter which may not work as I am not sure the meetings always end early.

https://support.microsoft.com/en-us/office/make-all-your-events-shorter-automatically-8fa0fdcb-5eee-4e12-9452-8d59ee33f70a 

Cheers