depends if you traffic stays at the stack/vlan or not. if you know your traffic flows and most traverse to another coreswitch (vlan x to vlan y) or to the cloud you are best of capturing only the uplinks.
@Atags - so how did things work out on Mirror port for all those switchports, did it affect switch CPU performance. Also is it possible to send stack 1 mirror ports source to another stack member?
Anyone if you have experience or knowledge this would be very helpful. I have an 8 stack of Meraki MS225s and I am trying to mirror 48 ports from 1 switch and send them to a designated port on switch stack 2. Therefore, I will have 90 ports mirrored to one port on Stack 1....does that sound doable.