You can connect two mixers directly with a CAT5e/CAT6 cable and you will have full AVB functionality. It is not possible to "chain" (daisy-chain) mixers. There is no "Master/Slave" anymore, but network presets like Stagebox, Monitor Mixer or Stand Alone Mode.
The 24R has 16 flex mix outputs, which can be used for 8 stereo in-ear mixes. Connecting a 16R in Monitor Mixer Mode means that input channels 1 to 16 are shared and can be sent to 6 flex mixes (3 stereo in-ear mixes). Channels 17 to 24 can NOT be used in a 16R, because this model is a 16 channel mixer - the only one there is, by the way. All other models are 32 channel mixers and the 64S is a 64 channel mixer.
If you can live with 8 input channels not available on the 16R, the solution will probably work for you.