Question regarding Server Power supply, Riser and 6 pin to 8 pin cables

[Daniel0303]

Server Psu breakout board usually comes with 6pin and convert via 6 to 6+2 pin cable x2 , is this safe?
Can i Power Gpu and Riser using 1 cable? e.g 6 pin to 6+2 pin x 2 , 1 6+2 for gpu and 6 for riser?
Which Psu Brand and model give 3-6 VGA cables?

I build few rigs with the rules of not more than 2 gpu per sata cable, what i usually does is 1 cable = 1 sata 1 molex

Due to i will leave my rig unattended i would rather spent a little bit more to keep it safe

Thanks