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I've never fitted one offset, it would be an experiment. Usually you use a solid pipe between the cistern and toilet, I guess that's got something to do with the water pressure of the flush. If you changed to flexible it would have to have 2 solid ends to connect to pan and cistern.
I usually pay £80-£100 for a hidden cistern and they are mounted on the wall with a couple of screws, the quality of the internal mechanisms & single or dual flush is probably why I spend more than £50. The expensive frame ones are normally used for pans that hang off the wall with no pedestal.
Having a hidden cistern just means a bit more of a fiddle for maintenance, if possible ensure access to the back of the toilet from a hatch or fit a flexible pan connector so you can connect the pan before pushing it to the wall. Try to at least leave access to the cistern, if it starts to fail you don't want to have to destroy your tiling. I've done a few where it's tiled behind the pan with a wooden top and white glass (I.e. No green tint) painted on the back. That way you have a nice waterproof surface but you can lift it off, unscrew the wood and get access to the plumbing.
Also check that your overflow, which should be internal I.e. Flows into the toilet not a pipe outside can evacuate water as fast as the feed into the toilet. If the inlet valve fails to shut off you don't want water overflowing the cistern. In fact everyone should hold down their ballcock and see if there cistern overflows, it's suprising the number that do.
Apparently flexible flush pipes are a thing, so you can have your offset cistern.
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Airhead
@chrisbmx116
Hate t ask another thing from the oracle (@Airhead) but...
Hidden cisterns... pretty simple things? Could I fit one offset (not straight behind but off to one side due to structural column)? What sort of price for bits needed would I be talking? Seen them from 50 to 500 but unsure what I really need... are the expensive ones for wall mounted so are more frame like whereas others are mounted within walls? If we ever meet IRL I owe you all the beers.