TB DP meter :
dpMeter is a precise digital audio multi channel meter including RMS, EBU R 128, Dialog gated and TruePeak (intersample) measurement. It is the successor of the very popular dpMeter4 and adds GUI resizing and preset management.
https://www.tbproaudio.de/products/dpmeter
Yes, ( Hotone ) Ampero is an in Asia based competitor of the line 6 Helix series which some of the User soundwise like more as the Helix.
The vst stomp seems to be a step behind the Ampero .
For side chaining I use the Sonitus compressor onboard Sonar nearly all the time- easy to handle .
For more colour the Waves SSL channel is an oldie but goldie and a good starting point.