Hi I have 4 Mikrotik Switches CRS325-24S+2Q+, is full mesh MLAG configuration supported?

Has anyone managed to implement this without RSTP going into effect?

I'm referring to the (4) High Availability configuration in the image below

We are tempted to do this, but got discourage because MSTP is not supported in MLAG assuming this works in RSTP it's a waste if one interface is alternate port and MSTP is the way to go for us