Well, I bought this specific board (PS-3423) and replaced the old one I had (SYR-791-A).
I use it on a double-opening door (patio door) with 2 electric arms-motors (300w each). This specific board gives a maximum motor load of 1200w so the 600w that mine have in total are just fine. It has no problem operating with 1 or 2 arms, as long as they are connected in parallel to each other and of course with their capacitors. In my case, I can't make any strange adjustments, for example, to open one for pedestrians, etc., since with any command, both arms will make the same movement, but it doesn't bother me at all. The adjustment for pedestrians (which opens the door slightly) would also be made on both arms, but I don't use this function at all.
I connected the power (phase and neutral) as the manual says, I placed my motor in the terminals (COM, 5, 6) and because I don't have any photocells or any terminal switch, I bridged the contacts from 7 to 12 together as you will see in my last photo. So as soon as you give power, the 5 small lights above will light up normally.
I put a beacon (220v) in terminals 1 and 3 (be careful, the power there is of course 220v as the manual and the images say, without interruptions (flash) so if you put a simple lamp it will light up permanently during the door movement). I bought a simple orange beacon, 220v IP56 and did my job just fine (a little less than 8€).
If for some reason you connect the contacts 5 and 6 backwards, then the opening and closing command of the door will simply be reversed and you can either reverse the wires (5,6) between them or turn switch 7 (motor direction change).
The control process is very easy. The specific board code (PS-3423) is of fixed encoding. Initially, we delete (reset) from the board if there is anything stored by pressing the code button until the light goes out completely (initially it lights steadily and then flashes), then we press it again and as soon as it lights up we leave it immediately and press quickly the button we want on our control (after resetting it as well). the light will flash briefly and we are ready.
The travel time setting is equally easy. After the door is completely closed, we press the other button (time), after a few seconds the door starts to open and as soon as it reaches the point we want, we release the button (in case we don't have a terminal switch like me). That's it. Our door will reach the same point every time we open it. In my case, with a double door, I did it a little before the leaves reach the doorstep and I'm fine. Every time it opens, it goes to the same point (without banging) and every time it closes, the motors stop making noise.

I am not a professional. I hope to help someone with my little experience.