SFP+ copper 10Gb cable length to Zylex

Hi, I have Two Zylex 10Gb switches running in campus. They are very inexpensive and i am trying to conserve the 10Gb Cat6 ports.
I need a recommendation for 10Gb NIC and SFP+ copper (DAC) cable back to DELL 12 and 13 Gen servers

10 Gigabit Ethernet - Wikipedia says 15 Meter but a few 10 Meter could cover about 8 ports for me.

I have one Qlogic based ASUS manufactured NIC that seems to be doing well on 5M DAC Active cable aside from a fouled driver install on a GEN 11 DELL server. That same NIC installed on a Gen 12 DELL Server running fiber went flawless. What I need to do next is a slightly longer run to a Gen 13 DELL Server via SFP+. DAC. About 2 months ago I found a Qlogic or other branded NIC’s and SFP+ DAC Active 10M cable sets on EBAY for about $500 but now I find nothing. What is the true maximum for SFP+ active? Intel and Cisco seem to have a history of hardware locking on one or both ends. Maybe true, I don’t know because I’ve only completed a couple runs.

Hope and Qain

turns out I was mistaken in this post. The nics were Broadcom 10Gb based ASUS branded, not QLogic. Once I found this out and started googling and building end to end (nic and cable) solution it became much easier.

How quickly the market can move, I ordered some more nics today and after a little more research turns out 2 transceivers and a 10M fiber cable are the same price as a 10M active sfp+ DAC. So all you cannibals... "See you in the funny papers."

I used FIBERSTORE for the transceivers and cable
(LC/LC duplex 50/125 10M SR 850nm 3mm armored aqua for all you fiber dudes)
and ebay for the Broadcom 57811S nics, $300 all in.