Propose me smart plug set

Hello, can you propose me set of smart plugs which I can use with HA. I have 2 peace Broadlink SP4L but when i add second one the first one became unavailable. I could’t find solution and i read that other plugs have the same issue. Any idea which model works fine when you add 4 plugs ?

People need to know what country you’re in.

I am in Bulgaria.