There are other routers in the dream series, such as the UDM Pro, UDM Pro SE, etc. . . but those would be a overkill on a 1Gb service, and they don't have built-in WiFi, so you'd end up needing 2 access points, instead of one.
Most of the more affordable prosumer routers are wired-only. The EdgeRouter-X, TP-Link ER605, and the TrendNet TWG-431BR are affordable, but will cap out around 925-940Mb, give-or-take.
What's going to help with multiple smart home devices isn't so much the router, but the WiFi source that they are connected to.
The so-called high-density access points will probably have the biggest impact on your performance.
The TP-Link EAP620HD (1Gb LAN port) or TP-Link EAP660HD (2.5Gb LAN port) can supposedly handle a ton of clients.
Unifi also has some access points branded as "HD".