I spent way too much time last week comparing how different brands like Dell and Razer handle the specific power delivery handshake with these Asus boards. It can be a real headache because the Strix G15 has that weird split between the iGPU and the dGPU depending on which port you're using for video out. Honestly tho, just head over to the ROG subreddit or the official Asus forums. Theres a huge compatibility spreadsheet some user put together that covers basically every brand out there. If you search for something like ASUS G15 docking station master list reddit you'll find it pretty quick... its the first result usually and has all the technical data on refresh rates and power draw you'd actually need. Its way better than just guessing which brand works best based on random anecdotes.

I use the ROG XG Mobile eGPU dock made by ASUS specifically for their gaming laptops like the Strix G15. It connects via the special proprietary port on the back and adds a bunch of ports like HDMI, DisplayPort, Ethernet, USB-A and USB-C. Plus it has a built-in NVIDIA mobile GPU to boost the graphics performance even more for gaming. Pricey but a great match for the G15.

Get the Plugable 13-in-1 USB-C Triple Monitor Docking Station, I love it.

CalDigit TS4

If you don't need an external GPU, consider a more affordable USB-C dock like the Anker PowerExpand Elite 13-in-1. It plugs into one of the G15's USB-C ports and gives you 85W charging passthrough to power the laptop, plus ports like HDMI, DisplayPort, Ethernet, USB-A, USB-C, SD card reader, and audio jacks. I've found it very reliable and portable to travel with my Strix.