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The monitor is 36.76 cm high without the stand.

The height of the monitor with stand is approximately 51.6 cm. The stand is height-adjustable, which makes it possible to adjust the position of the monitor to individual requirements.

It shouldn't be an issue, most people run different refresh rates for their primary monitor and secondary one. Personally, I've never had any issues with such setup. Make sure you enable scaling via the GPU and not the monitors (Nvidia control panel > Adjust desktop size and position > apply to GPU).

Yes, it is possible to mount the AOC CQ27G4X monitor with a monitor arm, but this is subject to certain conditions. - The monitor supports VESA mounting, but it is important to check if the specific VESA mounting screw compatibility is given. Some models may not have this option, so you should confirm this with your dealer or the official AOC department. - For mounting, you should use a mounting kit approved by the manufacturer and follow the instructions of the kit.

Maybe two metres or more