Most IPTV Reseller Panel platforms apply the same connection limit to every channel. That's a problem. I've watched a British IPTV family share one account. Parents watched news. Child watched cartoons. All fine. Then the father tried to watch a 4K sports stream while the other two were active. The panel killed all three. Why? The sports stream required more bandwidth, so the panel enforced the limit differently. The family didn't know this. They just knew your service failed during the match.
What actually works is a panel with channel-aware connection logic. Run a British IPTV multi-stream test through your panel. Start three SD channels. Then replace one with a 4K channel. Does the panel adjust? Does it warn or just cut? One reseller I know configures his panel to allow 3 SD streams OR 1 4K stream OR 2 HD streams. His IPTV Reseller Panel shows customers their "remaining capacity" in real time. No surprises. That said, most panels have one global limit. Your customers will discover its quirks before you do. Test edge cases yourself.