QM2-2P10G1TA on TS653 should I use for network only?

[ed]

Yes, this might raise a question about the bottlenecks. But in reality, the bandwidth will be shared. It will still be able to deliver 1GB/s even if shared
qm2-2p10g1tb Gen 3 X8 = 16GB/s
qm2-2p10g1ta Gen2 x 2 = 2GB/s

https://nascompares.com/answer/what-is-p...1-to-gen6/

I hope this helps.