re: AT&T modems suck but now I don't care

2800sqft 2 story house using the new ATT gateway router combo. I seem to get random disconnects in my office. Never happened before when using my Asus AC1900 router on my previous cable service. I saw a dual band Linksys Velop on clearance at Wal Mart. A 3 node service for $124 and individual nodes for $45 each. I imagine 2 nodes would be plenty. I don't need 1gb speeds in my network just looking for better stability. I'm only getting around 150meg in my office upstairs so even 300mbps would be an upgrade.