I heard the SLH5 in a very different space/system, and found it a little bright. Quite unlike the 40.2's that I ended up with ... Some people manage to put 40.2's in remarkably small spaces. If you have a full meter behind from the back of the cabinet, and good space to both sides, I would think it could work.
It just goes to show how we all hear differently and ultimately prefer different things; I demoed the SLH5+ and 40.2 in the same smallish (maybe 13 feet x 18 feet) room and found the SLH5+ tweeter to be lacking in resolution and speed for my tastes. I liked their midrange but overall found they lacked the musical excitement I was used to hearing with my current speakers at the time (Magicos) and ultimately live music. The 40.2 I much preferred and thought it offered more detail and certainly moved more air (and they didn't lack excitement driven by a big Pass amp). In the ~13 foot wide room I found neither speaker imaged much to the sides though, but then a larger room would likely help with this. The Harbeth dealer thought I could likely make the 40.2 work in my room which is 12x17 but said it would take a little work and $$ to allow my room to handle their bass. At 5.5m wide you have a lot more room to handle the big box speakers than I do (although I did live with massive Cornwall IIIs across my 12 foot wall for a little time before realizing they were just too big...).
I thought the D9 didn't have the same midrange magic of the Harbeths, but I did like their midrange more than the 804D3 and Kef Ref1 which I compared them to at a different dealer's showroom. I ultimately purchased D9s.
Maybe Magico to Harbeth is too much of a jump in sound signature for one to make...; I like to think of the Spendor D series as a sweet spot between these two sound signatures.
Not affiliated in anyway with the seller and have never heard Spendor Classic speakers but this pair have been for sale for a very long time and look like they would be a very fun speaker to listen to :)
https://www.usaudiomart.com/details/649600975-spendor-sp200-audiophile-speakers/
