Some motherboards want you to use the primary x16 slot (the physical x16 slot closest to the CPU) for video, others are better at auto-detecting.
Connect one card to the primary x16 slot using a riser. (An x1 riser can work in a physical x16 slot just fine. There are x16 to x16 ribbon risers, if that suits you better for any reason.) Connect this card to your monitor. (Alternatively, you could install one card directly, and just skip the x1 slot directly beneath it, since you only have 4 cards for right now.)
If you are using POWERED risers, then you should not need to use the supplementary 4-pin molex connections on the motherboard.
However, you must also use the 8 pin PCIe power connectors on each of your cards, regardless of your riser situation.
I would personally avoid the 1x SATA to 1x 6-pin PCIe adapters for a rig like this, but it's up to you. Some people have used them fine, others have had problems. I've personally used such an adapter for a 7770 that has worked without issue for years. However, the 7770 is a low-power card.
SATA connectors are not rated for the same current that PCIe or molex connectors can handle, and running things 24/7 far over-spec is generally a bad idea. I'm bringing this up since I notice in one of your images (
https://ibb.co/hC9rcQ) that you have one riser powered with a SATA to 6-pin adapter, and another SATA connector on the same line from the PSU is also connected to a similar adapter. I hope you're not planning on powering two risers with that one line of SATA cables. 2x molex to 1x 6 pin adapters are usually a better bet.
(As always, nobody here is responsible if you accept our advice and dislike the results.)If you say that using SATA to 6-pin PCIe adapters is not recommended, then if will avoid it as well. Can I power the risers using the "6+2pin PCI-E VGA Cables" as well? I mean this one:
So for EACH LINE two 6-pin PCIe for the riser powering (so I will need two lines for 4 GPUs for this)
AND two 8-pin PCIe (well this is also the 6+2pin PCI-E VGA Cable) for the GPU extra power at most. Am I Correct?