Netgear Orbi 370

How big is the home. Size of home, building materials will factor in how many RBS you should consider. Smaller sized homes, generally just need the main router unit and one maybe two RBS. Larger sized homes, two or more RBS maybe needed. I have a 5K multi level home and get away with two RBS. Wireless or ethernet connected. 

What is the size of your home? Sq Ft?

What is the distance between the router 📡 and satellite(s)🛰️? 30 feet or more is recommended in between RBR 📡 and RBS 🛰️ to begin with depending upon building materials when wired or wirelessly connected.

https://kb.netgear.com/31029/Where-should-I-place-my-Orbi-satellite🛰

No, need to use the DC power brick that comes with them. 

Your ISP Modem already has a built in router and wifi. This would be a double NAT (two router) condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT

https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT

Couple of options,

1. Configure the modem for transparent bridge or modem only mode. Then use the Orbi router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.

2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the Orbi router gets from the modem. Then you can use the Orbi router in Router mode.

3. Or disable all wifi radios on the modem and connect the Orbi router to the modem, configure AP mode on the Orbi router.

Static IP Address Configuration for AP Mode | NETGEAR Communities

https://kb.netgear.com/31218/How-do-I-configure-my-Orbi-router-to-act-as-an-access-point

 and https://www.youtube.com/watch?v=H7LOcJ8GdDo&app=desktop

Brand and model# of LAN switch you'll be using with the system?