This one supports 5Ghz : https://www.gl-inet.com/ar300m/

but : Dual firmware is installed. Nor firmware is v2.25 without 5G driver. Nand firmware is built with LEDE and have 5G driver. Due to a unknown Bug, the 5G AP is disabled by default and you can enable it in the web UI. (according to https://gl-inet.com/product/gl-ar300md/ )