Check out some useful tips on the differences between 5.1 and 7.1 channel receivers that can help you decide which option is best for you.
Yamaha 7.1 Channel Built-In Surround Sound Multimedia Home Theater Speaker System with Bluetooth Wireless : Electronics
My Favorite Home Theater Receivers of ALL Time
Sound alternatives to AV receivers -- The Teufel Audio blog
7.1 Channel AV Receiver: This Yamaha receiver has 7.1 channels for a surround sound experience. 8K HDMI Output: Supports 8K resolution for the best
Yamaha TSR-700 7.1 Channel AV Receiver with 8K HDMI and MusicCast
Sony STR-AN1000 7.2-channel home theater receiver with Dolby Atmos®, Bluetooth®, Apple AirPlay® 2, and Chromecast built-in at Crutchfield
Denon AVR-888 7.1-Channel/5.1+2-Channel Independent Zone Home Theater Receiver with HDMI I/O and Serial I/R Control (Black) (Discontinued by Manufacturer) : Electronics
5.1 vs. 7.1 Surround Sound: How To Choice?
How to Buy an AV Receiver in 2023 - CNET
How to Choose an AV Receiver
Going to 7.1-Channel Surround Sound