In particular, Electrum, as far as I know, is SPV wallet. How strong my privacy is with Electrum?
Check out Electrum Personal Server, it's like connecting your Electrum wallet to your own Bitcoin Core node, so you can use all the features of Electrum without the drawbacks of privacy.
https://github.com/chris-belcher/electrum-personal-serverSadly, I myself haven't used it yet, so I can't help you with any questions regarding it, but from the description of this project it sounds like exactly what you might need.