Like any similar device, e.g. mains intercom etc., that uses the mains cabling to communicate from one unit to another, they must be connected to the same electrical phase. If your mains supply is single phase, as in most domestic situations, this will not be a problem.
Other equipment connected to the A.C. mains such as freezers etc., which present a low impedance to the mains, can prevent such units from operating successfully and/or cause interference.
My advice is, "suck it and see", but when making a purchase, do so on the understanding, that the units can be returned for a full refund if they do not perform satisfactorily. To this end, keep the purchase docket and do not destroy or dispose of packaging.
In situations such as this, "the proof of the pudding is in the eating"!
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