So to set up 5 BNs on 1 VPN, I should configure ports in that way ?

1st BN , port=8877 , rpcport=8878

2nd BN, port=8876 , rpcport=8879

3rd BN, port=8875 , rpcport=8880

4th BN, port=8874 , rpcport=8881

5th BN, port=8873 , rpcport=8882

....

port decreasing, rpcport increasing to make it simple, I got it right ?