Could you recommend a good APU for the So.AM4 socket, with which I can play and record Fortnite in good quality?
There's no such thing. If you do not work hard you will not see any results.
The best thing there's currently is a Ryzen 3400g. But that will not go well with that.
There's hardly such a thing. The only way out would be a capture card, but it costs 100 euro more. Why do not you take a right card?
Even so, the best APU only creates low to medium settings if it's supposed to be high FPS (> 30)
What does not mean here?
Is that even possible? I have my doubts. In good quality (whatever that means)
APU's are made for something like that…
If you do not have a graphics card, then just buy a GeForce GTX 960 or something. They are damn cheap and will be sold on e-Bay for 15 - 30 euro:
https://www.ebay.de/...2735804201
https://www.ebay.de/...3142448740
(These are offer prices, but if you look around intenet exactly you will find also cheap immediate purchase offers)
The graphics card is completely sufficient for what you want to achieve. I have exactly the same
Fornite is a simple game.
Can my 15 year old Intel Quadro 6600 even.
So. No challenge for my CPU.
The important thing is always the graphics.