How to route traffic through vpn using 3proxy?

Question

linux

You need to set up this configuration.
there is access to 20 vpn servers. (that is, our server will connect via vpn to hide its ip)
you need to raise the proxy server as follows.
It is necessary that vps simultaneously connects to all 20 vpn (the figure is taken as an example)
further on our vps which has a white ip. for example 193.21.21.10 we raise
the proxy server as
follows proxy ip_vps:8001 go further through vpn 1 Connect to proxy ip_vps:8002 go further through vpn 2
We connect to the proxy ip_vps:8003 we go further through vpn 3
We connect to the proxy ip_vps:8004 we go further through vpn 4
We connect to the proxy ip_vps:8005 we go further through vpn 5
how to implement this scheme, by what means. rummaged through the entire Internet, I can’t figure out how to set up
the question, how to do it, and who can draw up a manual in detail. for a small reward

Answer 1

socks5 will save you
vpn and proxies work at different levels, although, of course, you can try it through iptables

Answer 2

proxy -p8001 -eIP_VPN_1
proxy -p8002 -eIP_VPN_2
proxy -p8003 -eIP_VPN_3
where IP_VPN_1 is the IP address of the local interface of the first VPN.