Hi, I have the ZMI QB826G and I'm 99% sure it blips the power when starting passthrough. Do really like the thing though (except for the display that remains on while in use and is fairly bright)

I have another solution for you: I've been using https://de.aliexpress.com/item/1005005036674891.html for my router and it's been pretty good so far for the six months or so I've had it. I was made aware of it from an electronics Youtuber I trust who did a teardown and was impressed with the quality and safety. Sorry I can't find the video at the moment.