"Klara" replied:
We have a couple in the front. We have large decorative flower pots on
them, surrounded by cobbles - everything can be moved off if necessary for
servicing.
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My wife and I also have two 1½ ft. diameter manhole covers at the side
of our back garden lawn and two more in the front garden, plus a water
meter cover! We too have large flower pots on the back garden covers
and have two low growing bushes artfully concealing the two out the front.
We have lived in our present house for one year and nine months and as
yet, no one has asked to inspect or service the drains on our property.

MCT