【安全上网】如何实施VPN + Tor 的方案？

【先声明，本人网络小白一名】
之前一直在海外用品葱（with tor browser），最近因为要回国一段时间（半年左右），想了解一下国内安全上网的有关问题

Connecting to a VPN first, then Tor (also known as “Tor over VPN” or “Onion over VPN”) gets you all the privacy protection of the Tor network, plus added protection that prevents any Tor node from seeing your home IP address. You will also not have to worry about being flagged by your home network for using Tor, as all that network will see is encrypted traffic to your VPN server.

Tor over VPN also provides access to the Tor network even where it is blocked, such as corporate and school networks, or certain countries.

Another advantage of Tor over VPN is that your VPN service will not see what you are doing inside the Tor network. And if there is a bug in the Tor Browser (as has happened before), connecting to VPN first will put an additional layer of security between that bug and you.

Setting it up is easy: Just connect to your favorite VPN server and then launch the Tor Browser.

根据express vpn 网站的说法，只要先连VPN，再打开tor浏览器就可以安全上网了
https://www.expressvpn.com/vpn-service/tor-vpn?gclid=EAIaIQobChMIhaD6iZeN5wIVEA4rCh1_Fge7EAAYASAAEgKrGfD_BwE

但我还是有点不放心【觉得太轻松了】，想问一下真的是这样吗？

tor 浏览器安全设置里前置代理需要另外填写嘛？

Tor浏览器的安全等级最好调到哪一档？

以及有葱友在国内试过VPN+Tor 的方案吗？