I don’t see MAC address as parameter for network device?
Except added as custom1..3?
I can add it to link [Interface.PhysAddress]
(as for snmp devices/as level 2 switches/),
but, I will to see it as label for network device/computers,ip cameras/…
If you have custom images added to network device, it’s better to have links from such device at border (of shape) then have
all links in one point…
Or… do not put the link-info window (Tx:, Rx:, etc.) on the exact middle of the link as from device center to center, but at the middle as from device border to border (hope this makes sence 
).
Currently, if you have a ‘large’ device linked to a ‘small’ device and they are placed close together on the map, the link info window will be (partly) under the label of the large device, cause that’s the middle from device center to center.
Even better: make the link label position changable; it’s not always handy to have it in the middle.
Yet even better: make the link (optionally) a multi-segmented line; it’s not always handy to have it be a straight line.