With other words: I need another Pro Plus plugged into the receiver’s out on one side, plus one Mini connected to each receiving wireless speaker on the other end?
Wireless speakers can’t pick up the signal sent from the Pro Plus on their own? I thought that’s what makes them wireless speakers in the first place?
Maybe you were referring to just powered speakers?
Please, have you identified which Wi-Fi protocol(s) your remote Wi-Fi speakers support?? AirPlay, ChromeCast, Bluetooth, other??
WiiM supports Line-Out, Digital-Out (Optical/SPDIF), Bluetooth - to any one output at a time. WiiM also supports multi-room output via AirPlay, ChromeCast, and WiiM's own Multi-Room Protocol - again to one protocol/group at a time.
So, you literally have your pick of output options...
Of the WiiM devices, the WiiM Mini is the most affordable - and least capable. It lacks ChromeCast and SPDIF, and has a weak ADC.
Next up, the WiiM Pro adds ChromeCast and SPDIF and RCA-Out Connectors, but shares the ADC of the Mini.
The current top device is the WiiM Pro Plus, which dramatically improves both the ADC and DAC.
Again, you have options...
If your Turntable has a capable built-in Phono Preamp, and your Stereo Receiver and Remote Speakers support either AirPlay or ChromeCast, you could use a single WiiM Pro Plus as your centerpiece with the TT connected to its Line-In and CD/DVD/TV to Digital inputs and send output to one AirPlay or ChromeCast Speaker Group that includes all your output devices.
If your Turntable needs the Phono Stage of your Stereo Receiver, then place the WiiM Pro Plus on a Line-Out/Pre-Out from your Receiver to source Phono to the AirPlay / ChromeCast Speaker Group that now includes just those Remote Speakers as you drive your Stereo-connected Speakers via the Stereo. And include the Stereo Receiver in that Speaker Group when you want Streaming Audio from the WiiM Pro Plus.
Or, you could add a number of "satellite" WiiM Minis directly to each set of Remote Speakers (if they have Line-In), and leverage the WiiM Multi-room protocol which adds its own Latency Control to the mix (plus the ability to split off a Room unit to play from its own WiiM provided Streaming Source).
Options...