Victron Multiplus-II 2*120V and Progressive Industries EMS-LCHD50

[Ozzie Cozzies]

I currently have a Progressive Industries electrical management system EMS-LCHW50 installed. I've recently bought a Victron MultiPlus-II 2*120 inverter/charger and about to install it shortly - along with other solar install items. I would have assumed the logical AC wiring would involve
* 50A shore power to EMS,
* EMS to transfer switch, and Generator (Onan5500) to transfer switch,
* Transfer switch to inverter/charger, and lastly
* Inverter charger to AC distribution panel.
My issue is that reading the PI operating and instruction manual for the EMS (https://www.progressiveindustries.ne...b8577bfb5a.pdf), it clearly states on page 3 "Never plug the EMS into an inverter". Also, the Victron MultiPlus-II manual (https://www.victronenergy.com/upload...30V-pdf-en.pdf) stipulates on page 14 that the AC-In "must be protected by a fuse or circuit breaker rated at 50A or less, etc....".
As I understand, the EMS protects against high/low voltages and surge protection currents(much greater than 50A). Although it is rated for 50Amps, what's the consensus on it protecting the I/C for currents slightly above 50A, and whether a fuse/CB is necessary.
Also, there were some previous issues back in 2019 with connecting the EMS to the Victron I/C. The I/C developed buzzing noises, but then Victron issued a firmware upgrade to rectify the problem - i assume the latest models have this upgrade. Has anyone had any experience/issues with connecting the PI EMS into a Victron MultiPlus?