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In Ireland we have 2 public service broadcast FM stations : RTE Radio 1 and RnaG (in Gaelic only). RTE also operates 2fm (music driven station), and LyricFm (Classical/arts) on a purely commercial basis. On DAB they've been playing around with a few digital channels non-commercially.

We then have Today fm and Newstalk which are national FM commercial operators.

Then there are a whole range of regional stations.

Then, the section with the largest audience share, the local commercial stations which typically target one city or county. Larger population centres have quite a few of these, where as in rural areas there might just be one local station.

Finally, there's a whole layer of community stations which are operated by community groups, universities, hospitals etc. These are often manned mostly by volunteers and typically have a low powered FM transmitter covering a fairly small area.

You also get small stations going on air for special events etc.

The radio sector here is very heavily dominated by commercial radio in much the same way as the US.

Commercial AM licenses have been available for decades, but no stations seem very interested in them anymore.

With regards to site sharing, again it would just come down to practicalities and what stations agree upon. ComReg, our equivalent of the FCC encourages broadcasters and telecommunications companies to share masts (towers) where possible to minimise visual impact and make it easier to monitor RF emissions.

AM stereo was indeed introduced in 1985 using the C-QUAM system. I built up a stereo receiver late 1985 using the Motorola IC and a valve front end. The sound quality was excellent, with much better channel separation than FM. By using a low selectivity front end you get the full transmitted bandwidth, which in Australia is usually not limited unlike in Europe.
It bothers me greatly that AM broadcasting has such a stigma when the transmitted signal can be very good if the station does the right thing. The problem is all these appalling solid state receivers with 3KHz bandwidth. Listen through a proper receiver and you won't need FM.
As to the eventual outcome of AM stereo here, it died away in the late 1990's. While there was a lot of promotion at the start, available receivers were few, although some car radios did have it. For talk stations, stereo is a wasted effort and there's no need for it. Given that Sydney had only four music stations on AM at the time there probably wasn't much incentive to buy a stereo receiver.
1053 2CA in Canberra is the only AM stereo station left that I'm aware of. Fortunately I can receive it at night and it plays decent music.

My 89 Chevy had an AM stereo radio in it but there were not many stereo stations. Most of our AM band was either talk radio or latino.