I have fitted isofix to my 54 reg cmax.
quite easy but a bit fiddly.
Firstly you need a kit from ford part no 1332664 (3M51 R613A08 AB) other no on box.
Or if you buy the britax duo plus seat you get the plastic inserts with the seat.you will need the top tether kit also.
Then its just a matter of cutting the seat and getting the foam out to access the iso fix bars.
Then the plastic inserts clip onto the bars and its done.
Took me about 20 mins to do both.
It's easier to do with the seats removed from car.
Good luck.
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