Check the official VESA specs of the monitor and the mount, as well as the specifications in kg. Simple.
The only thing that matters is that the Vesa mount fits. And that will be 100 for both (without checking).
Yes, the mount is compatible with the AOC Q27G42ZE. It supports monitors up to 34" with VESA 75x75 mm or 100x100 mm and a weight of up to 9 kg, which fits the 27" monitor.
The AM400B is compatible with the AOC C27G4ZXE if it has a VESA standard of 75x75 mm or 100x100 mm, a size of up to 34" and a weight of up to 9 kg. Check these specifications on the monitor, as the mount supports any suitable VESA monitor.
The AOC Q27G2E/BK fits on the monitor mount if it fulfils the VESA standard 75x75 mm or 100x100 mm and weighs no more than 9 kg. The mount supports monitors up to 34 inches and a maximum payload of 9 kg. Since the AOC Q27G2E/BK is a 27-inch monitor with VESA 100x100 mm and usually weighs less than 9 kg, it is compatible with the mount.
I have a Samsung ViewFinity S9 in 27" mounted, so the weight should not be a topic.
However, if the monitor arm is to be used as shown in the picture above, it will protrude from the side of the monitor.
The screws for VESA mounting are normally included with the monitor mount. In this case, it seems that the installation materials that come with the mount should include the necessary screws. However, if you cannot find any screws, you should contact the manufacturer to make sure that none are missing.
The Samsung Odyssey G5 34" fits on the AOC AM400B monitor mount, as this is suitable for monitors up to 34 inches and supports the VESA 75x75 mm and 100x100 mm connections. However, you should make sure that the monitor does not weigh more than 9 kg, which is the maximum payload of the mount.
The AOC AM400B monitor mount is suitable for tabletops with a thickness of 15 to 50 mm. Since your tabletop is 7 cm (70 mm) thick, it does not fall within the compatible range. The mount will therefore not fit your tabletop.
Yes and no. The plate to fix the base to the monitor is attached with 4 screws. --> This is not quick and I can't say anything about the durability of frequent loosening / fastening.
However, the table base consists of 3 swivel joints whose "manoeuvrability" can be adjusted with grub screws.
Nothing wobbles on the base itself, even if the table is bumped, for example, the vibration of the monitor remains very low and also dampens itself very quickly.
If the grub screw on the joint directly behind the monitor remains loose, the monitor can be pulled upwards.
Concerns:
1) Do you realise that 2 cables (power & signal) must then always be unplugged?
2) The monitor will rest on the screen (part of the base is at the back), wherever you want to store it when not in use?
The AOC AM400B monitor mount allows flexible adjustment of the monitor, but not rotation into portrait mode and back without adjusting the VESA mount. The monitor can usually be adjusted in tilt and rotation, but a complete rotation into portrait format is usually not possible without adjusting the VESA mount.