Electric baseboard heater

I’m thinking of trying one of the devices listed on my recent post.

I am going to try this on one of my smaller units.
NuTone NFS20Z Smart Z-Wave Enabled Isolated Fixture Mounted Control, White https://www.amazon.com/dp/B00WXLRF2U/ref=cm_sw_r_cp_apa_i_qFpsCbWPWJ6HQ

$70 would get expensive real fast … each baseboard is in its own room. So I would need 7 … ugg