The adjustment will adjust the err camber I think but Im forget. However a few mm chnage wont matter to much. If you go ajust height by 1cm or so then getting tracking done again is necessary realy otherwise the car will handle wierdly and tyres will wear out on the inside very quickly.
You dont need nay other tools to adjust the height though. To fit coilover you need some spring compressors realy so that you can take your normla springs and shock to pieces etc.
ktec one do have some adjustment in the back height wise but however high or low you make the back wont make any difference realy to the camber etc and you cannot easily ajust them anywhay as you need shims etc to do that.
The dci is the same as all other Mk2 Clios so a 172 strut brace will fit. make sure you get one which bolts on to the strut tops though and not just overbolt to the normal suspension top mount bolts.