Pytes Storage Extension

I’m using a Victron System 3x Multiplus 48/5000 with 8x Pytes E-Box 48100 since 2 and 1/2 Year. I would like to upgrade with additional 8x Pytes 48100.

(Reason is just to increase days of being independed from onshore power). I noticed that 16 Pytes are supported, but I may need to upgrade all to latest software 1.5.28.C16. I believe I would be able to manage that. Are there any other restrictions I need to take care?

Thanks

Thomas