Ubiquiti EdgeRouter in a satellite office for site-to-site VPN?

We have a central office that has a WatchGuard FireBox, which is acting as a VPN server (using IPSec and IKE)

And we have 4x satellite offices, they are retail stores and each one has two computers and a single employee who runs the store.

We have old consumer NetGear routers at the satellite offices right now that provide a site-to-site VPN connection between the satellite office and the main office. We're replacing them and I'm planning on putting in either Ubiquiti EdgeRouter Lite or Ubiquiti EdgeRouter-X .

I'll need to configure each EdgeRouter to to connect back to the FireBox and connect the satellite office to the main office via a site-to-site VPN.

The main office has ~10 users, and the satellite offices have 2 users (they are a retail store). The main office Internet has 10mbps upload speed, and the satellite offices have ADSL Internet that gives them 1mbps upload.

Ideally I'd like to use the Edgerouter-X since it has a PoE port and a built-in switch that I can connect a UniFi Access Point to. But I've also heard the EdgeRouter-X doesn't have hardware off-loading of the IPSec encryption and this can dramatically affect performance. On the other hand I'm not really sure if the EdgeRouter Lite does this either.

Can anyone comment or confirm that these routers will be suitable for doing this?
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Frosty555Author Commented:
I ended up buying the EdgeRouter Lite ERLITE-3 model, and the site-to-site IPSEC VPN works just fine.

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