Dell U2720Q Monitor

https://www.dell.com/en-us/work/shop/ultrasharp-27-4k-usb-c-monitor-u2720q/apd/210-avjv/monitors-monitor-accessories#support_section

When connected to a Mac I set the scaling so it "Looks like 2304 x 1296". You may need to Alt click on "Scaled" in the Display settings in System Preferences to be able to pick this resolution.

In order to enable 60hz on MacOS I had to enable an HDR mode in the monitor's OSD:

Display -> Smart HDR -> Changed from “Off” to “DisplayHDR”