Second monitor needed - will they interfere?

[orangecat]

Our house in on 3 floors. DD going into loft room to make way for new baby on 2nd floor. Can't hear anything from 3rd floor downstairs, so now need 2 monitors. Don't want to buy a new one if they are going to interfere with each other. Current one is BT digital one. Any tips?

We've got a Philips one with 4 frequencies. SIL has got two the same model, one for each of her DCs. So when all the cousins are napping at PIL's house, we have three channels running. No interference.

We have 2 Philips ones, one on channel A and the other on channel B. They are both the more expensive model, initially we tried the cheaper model for the second one but they interfered with each other so we had to return the cheap one and get the more expensive one. So you may need to get 2 of the same make/model.

We find that we still do get some interference, the Channel A receiver picks up noise from the Channel B transmitter, but it's not too bad.