Rhino R4FXO-EC and Sangoma A101D-X possible on the same Dell server?

Hi buddies,

Here's the situation: A client has a T1 split as half voice and half data. The terminating point is a Cisco 2811 router with 2 T1 ports, one to connect to a Telco Central Office, the other one to connect to the Sangoma A101D-X port on a Dell 840 server.
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But the T1 service is not that solid. There have been some downtime for the past year. So the clients wants to keep 4 analog lines and plug them directly to the server. Then if T1 goes down, they are still connected to the PSTN. (copper lines are rock solid.)
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My question is, is it difficult to install the Rhino R4FXO-EC on a PCI slot, install the Sangoma A101D-X on a PCI-e slot and configure them in Trixbox CE? I would greatly appreciate your experience on installing them at one server!

Also what's the current stable version, sorry for a dumb question from a dumb villager....