Network TV Tuners and Network Traffic

I am considering replacing my internal TV tuners with some network tuners instead.

I would be really grateful to know, from any one using them, whether they cause any problems in terms of traffic on your network.

I have a gigabit network and would ideally like to have two DVB-T2 and two DVB-S2 tuners.

Worst case scenario might be recording 4HD streams whilst streaming another 3HD streams to three clients.

Is this sort of set up likely to cause any problems?