2 ZS box redundancy

Hello All:

I am wonder if this can be done.

environment: 2 ISP

Given:
each ZS have 1 external IP from each provider on the each WAN side, with NetBalancer on.

each ZS also have their own internal IP on the LAN segment.

WISH:
Can the ZS run VRRP (like service) for outbound to internet.
Can the ZS also share a VIP like interface between the 2 devices for each interface to handle the redundant inbound?

Thanks for any input.

Kou