Nope, Gr3 won't do. Since you want ot balance, you'll need to skip FastTrack. Without it gr3 won't be able to cope with bandwidth.

You need more power. 4011 will do for example

can route 980 Mbps with 25 firewall rules and 512 bytes packet size.

can route 980 Mbps with 25 firewall rules and 512 bytes packet size.

512 bytes are fairly large packets. Most packets are a lot smaller than that. A lot of acks, etc. So the number you should look at is the one on the right, for 64 bytes. Mainly for two reasons, first it kinda provides a worst case scenario which is what you want to look at if you're looking for assured performance. Second, these are lab tests and not real world. When considering real world performance there's often other stuff going on on the router that also drains performance. You're usually NATing, the bridge consumes CPU time, OP will be marking packets for the 3 WANs he'll be using, etc. So even though some packets will be larger than 64 bytes and you may not be using 25 filter rules (10 is usually min but mangle rules consume about the same CPU time as filter rules), real world performance is still going to be less (sometimes a lot less) than those numbers.

So it all comes down to what he's expecting. 30 mbps up and 40 down full duplex tcp traffic over 3 interfaces can reasonably be expected from your suggestion. About 30-35 total will work from 750Gr3/hEX.

The games are going to be Fortnite, LOL and CS:GO, 10 pcs for each. Fortnite is by far the harder one. CS.GO dont uses much, and im not sure about LOL.

Nope, Gr3 won't do. Since you want ot balance, you'll need to skip FastTrack. Without it gr3 won't be able to cope with bandwidth.

You need more power. 4011 will do for example