Yes, it is. With the monitor mount, you simply have to make sure that the VESA type 100 x 100 mm is supported.

I have had this monitor for a few months now. Windows should be left at full resolution, otherwise it can look unsightly. The blurriness is noticeable in games but not particularly bad (I have changed my hardware a lot over time). I can still only recommend the monitor, even for an RX470, especially for less graphics-intensive games.

For the PS4 pro you need a 720p, 1080p or 2160p compatible display. The 2160p would be the highest possible resolution but the AOC Agon only supports 1440 in height, so you can only select 1080p with this combination. Don't be confused by the specifications on the PS4 Pro. Certain games come with other resolutions in between. However, this does not mean that the monitor will display them. The PS4 upscales the pixels to the resolution you set (720p, 1080p or 2160p). In order to benefit from the PS4's 4k, you would have to buy a monitor with a resolution of 3840 x 2160.

It already exists. You only pay the premium price for G-Sync. The screen is certainly worth it even without G-Sync. You just have to decide for yourself whether you really need it. Maybe you can find out a bit about it from Mr Google. The 27" equivalent to this monitor with G-Sync is currently on sale, almost as expensive as the 24" with G-Sync: AOC AGON AG271QG (27", 2560x1440) Still the 24" model with G-Sync in comparison: AOC AGON AG241QG (24", 2560x1440)

The problem is, G-Sync makes a big difference in the price of most monitors. I don't currently know of any G-Sync monitor that can keep up with this price/performance ratio. I bought an Acer Predator X34A (34", 3440x1440) myself because of G-Sync, without G-Sync all comparable monitors were about 100-300 francs cheaper at the time. The monitor is certainly also good with an Nvidia card. It depends more on what you need the monitor for. G-Sync and Freesync are especially good for fast movements in games. Professional gamers swear by these techniques (I'm not a professional gamer, but I can see the difference). Casual gamers or others usually don't care or hardly see the difference.

HDMI does not (yet) support 144Hz mode. You will need to use a mini-DP to DisplayPort cable or a DVI cable and an adapter.

The monitor is 41.5 cm high at the lowest height

Not as far as I know, only works with amd cards

Normally Digitec MUST supply the appropriate plug/adapter with imported products. If you receive the monitor with a German plug, simply contact customer service. This will then be supplied free of charge.