Sonicwall TZ100 seperate subnet and use existing image

I have already created my master image of my master computer using Acronis Universal Restore. My first question is am I able to somehow import this image onto the acronis snap deploy server to use to deploy to clients, or must I create a new image using the tools in Acronis snap deploy?

My second problem/question is with regards to booting computers from the pxe that are on a different subnet. I have a sonicwall tz100 and the clients I want to deploy to are on a seperate subnet. The sonicwall is responsible for handing out IP addresses to these clients. When I look at the advanced tab of the dhcp configuration is has the following:

Network Boot Settings:
Next Server-(blank-enter ip address)
Boot File-(blank-enter boot file name)
Server Name-(blank-enter server name)

I imagine I should enter in the IP address of the server running acronis snap deploy for "Next Server" but what should I put in for "Boot File"

Has anyone had any experience with making this work?

Thanks.