Please tell us some basic information before asking for help:
How to install it... Can you guide me??
You have to unlock bootloader first then install twrp recovery after then you have to flash the rom.
Root your device (have rooted my device since 1 year and going very smooth and using all banking apps, no issues. Control to give root permission is in your hand)
Search How to Root And Flash TWRP (using v3.3.1) and Unlock Bootloader. Easy if you have pc.👍
Google Up Custom Roms For Asus Max Pro M1 and get paranoid android 5. So much stable and excellent battery/performance. I'm using that for a long time now.
One Guide Attached: https://forum.xda-developers.com/t/guide-aio-ultra-noob-ultimate-guide-for-max-pro-m1-bt-custom-roms-etc.3915011/
You can do some research on these stuffs yourself to use your phone comfortably for the rest of your life.
XDA Asus Max Pro M1 Developers are the best.
You hve to unlock botloader first then install TWRP recovery then you have to flash the ROM