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“i was going to use the cable tv sheild as my ground and the neutral.”
That is a good approach. Check the continuity between the cable shield ground and the neutral buss bar in the breaker box. Hopefully it will present some resistance instead of a full continuity. But the couplers can tune even with a .5 ohm inductive load. Start with 1 or 2 watts and tune up for best vswr on the coupler. Place the coupler as close to the nearest cable outlet that is nearest the neutral coupling point. This will help keep that return pathway to the coupler as short as possible for maximum signal injection onto the neutral buss.
No doubt this will give you full building coverage and then some! Quite possibly even over into the next building without having to run a repeater or splitter at the TX point feeding two couplers.