Roger Mills wrote:

In the close-coupled setup, the weight of the cistern is supported by the
pan - and it's just steadied by a couple of screw into the wall. With a
conventional pan, the cistern needs a couple of wall-mounted brackets
under it for support.

The brackets probably aren't necessary. The low level cistern in our
previous house was held up with just 2 screws and had been like that for
about 40 years by the time we moved out. The current house has 2 toilets,
one close-coupled and one low level. The low level one is supported by just
a couple of Rawlbolts, it's probably been there for ten to twenty years and
is showing no sign of wanting to part company from the wall.

--
Mike Clarke