Need help to connect smart plug to different network band

Hello,

Am I out of option to use 2.4 GHz smart plug to my 5GHz only router?

My router is Arris - Surfboard Extreme N300. Although its a dual band router, I cannot use both simultaneously and I don't want to switch back to 2.4.

All of the smart plug on Amazon runs only in 2.4. Is there a workaround? or do I have to buy a router that can run both bands at the same time?

Please advice. Thank you.