Standard practise for years to put pans on plinths.
Please note the wooden plinths often rot. The male of the species tends to not be very careful where their urine goes, especially when inebriated and off target aiming can result in it missing the pan and being absorbed by the plinth, so it rots quickly.
The "off set" Multi Kwik is designed to accommodate pan outlets higher than the soil pipe.
I forget which way around they are exactly, but in the old days the toilet pan outlets where not all the same and to a certain extent the same applies today.
Some of the modern pans have a very short spigot outlet that barely sockets into a Multi Kwik unless its near enough in line.
In other words there is not much deflection tolerance.
So Multi Kwik make a variety of off set Multi Kwiks to suite different situations.
I have not checked their recent catalogue but they also made a pan connector with a couple of different pan spigot outlet sizes as averse to soil pipe sizes.
So its a case of matching the connector to the situation you find. Unfortunately most merchants do not seem to stock the whole Multi Kwik range I don't think, so you generally have to compromise.
Basically as has been said, try to avoid soil getting trapped in the WC connector.