UbiquitiNetworks etc-24-poe gene 2-switch

Does it matter if i am using a non uni router in front of this switch, as i am using the cloud key v2 controller and uni access points?

Are injectors needed for a 500ft connection and would cat7 or cat8 be the recommended cabling? Could I use Eufy, reolink poe cameras with this device?

Does this switch support 802.1q for vlan with udm-se

What’s the Total Poe watts?