i am definite that the 1 to 4 pcie riser slots is not at all going to work with this motherboard
moreover i read a lot about these and these expansion cards had good success with amd cards but not at all with nvidia cards
so i will recommend avoiding them entirely

Okay. I am currently mining in my home PC with two GPUs installed in this motherboard. Thought that this raiser would help me in adding some more GPUs. Is there any other way to increase the GPUs along with my current setup?.
There is another 1 to 4 PCIE riser that has four USB cables each connecting to a riser as shown below. Anyway this differ from the above one?
https://i0.wp.com/www.thegeekpub.com/wp-content/uploads/2018/02/4-in-1-PCie-Riser-0002-Yeehun.jpg?w=649&is-pending-load=1#038;h=423&ssl=1