DS320PR410: DS320PR410RNQR series connect questions

Part Number: DS320PR410

Hi sir, 

Here are some questions about DS320PR410RNQR .

1. Redriver layout rule

2. As DS320PR410RNQR is on riser card, on Motherboard already has 1 pcs redriver. Therefore they form series connection. Is there any concern for DS320PR410RNQR series conection?

    

Thanks a lot!