Hello

I would need to cover a multi-functional household object with 2 rentable rooms for corporate purposes. The main connection is located in the technical room as an ISP Router with its own WIFI. There is a patch panel with structured ethernet cabling throughout the building.
The idea is to connect the inbternet connection of the technical room room with the Deco S7 with settings of router mode, where I will create my own SSID for each antenna. It is a 2 pack, which means that each antenna will be like a separate router with its own IP rank. Will these two points be separated from each other by network? I understand that I will have the actual network on these end points and only the dynamic IP will be received directly from the ISP router at the input. The ISP router will be like a link for these two separate points. The question is, in the network of this router, will I see only the antennas or also the devices connected behind them? That is, each network will be separate only with the fact that the ISP router will only see the antennas? Yes?
This way we would have 3 SSIDs
1. ISP Router - own SSID (household)
2. Deco S7 - own SSID (company 1) - connected via ethernet cable directly to the ISP router
3. Deco S7 - own SSID (company 2) - connected via ethernet cable directly to the ISP router
I would also be interested in whether the antennas can be used in one network in this setting (both act. as routers). The mobile APP must then also be separate for each network of company 1 and especially for company 2??? That means I must have to loginst to each antena and ftrom that manage every network separately?
This solution is more for households, but I need to find out if it can also be used this way

For me the best sollution where Turn off wifi on ISP router. Buy 3 pack Deco S7 and create three separat networks with each antena for household, Firm1, Firm2 but the finmances ar short on thius. correct? Is this the beter solution?

Thank you Ervin