Pretty sure the answer is no and even if if it was yes, Zentyal really has never been the distro for that kind of thing, more of a job for 'router' type option like IPCOP, m00nwall etc.
Even then you may encounter issues as cable/DSL boxes these day are now almost always standalone boxes connected by Ethernet and LTE/3G Modems are typically USB its those form factor devices that are supported best.