The R-N2000A is a stereo receiver (stereo integrated amp with built-in dac/streaming capability) for 2 channel audio. It is for stereo use and won't accommodate any additional wireless speakers.
The Aventage line of Yamaha receivers, RX-A4A, RX-A6A, etc are multichannel receivers. Such receivers will accommodate 5 or 7 or 9 or 11 speakers depending on the model and will pair with some wireless speakers from their musiccast eco system. The latter type of speaker can be set up as a wireless surround or rear speaker. These receivers have built-in streaming features and don't need your Wiim.
Get something that better fits your use case.