Cerbo & PLC possibilities + how to add many contacts relays + many Temperature sensors

Hi,
Ok, we are www.AMOOVO.COM young Energy Storage Manufacturer, in Belgium
We work with Victron

Questions for Cerbo GS, Venus and anys Victorn PLC :
1/ What options exists to manage many Relay NIO and to manage many Temperature sensors ?
2/ Also, can we use other ports as tank to do this ?
3/ How can we connect the Cerbo GX to an other device with many relays and Temperature sensors ?
4/ How many Cerbo can we connect together on the same place ?
5/ How do we connect them together?
6/ How does other users do when they need more the 2 relays NIO ?

7/ Also people say Victron is preparing a 15KVA 3 tri 400V high voltage inverter with all in one (Mppt, Cerbo,...)....Have you any info or datasheet ?? When coming on the market ? Price ?

8/ Also actually Multiplus are low price ....will Victron keep low price for long term no ?
This is so important to know because when we see clients, they ask cotations...and when Victron stops low price, Huston we will have big problems.

Great magic Team you are !!! Victron & the Nederlands will save the planet, I am shure, you're the best !!

Thanks

Bjorn