I've only got 4 but trying to make life easier and increase maintenance. However the Aldi one should suffice.Some very capable ones around for keen money. Diminishing returns kick in quite quickly as the price rises. I've only got 7 bikes, so don't really have much use for one really, so for occasional use found the cheap Aldi on very splendid.
I have an Aldi one. 3 years old and still working as it should