What speaker could safely be ordered without hearing it first?

One's you can return, hopefully within driving range, or, risk return shipping as the price of getting out of the wrong thing.

or

Ones with LEVEL controls, allowing you to adjust their frequency distribution in your space, that location in that space, to your 'taste' or specific hearing characteristics!!!!!

I can't imagine many dealers are going to let you take expensive speakers home, unbox them, audition them,re-box them and then bring them back.

Crutchfield.

Audio Advisor.

Music Direct.

And that's just the start.

I tried out Dynaudio, Martin Logan, Fritz, Salk, Ascend, Focal in my room. All had return policies. The Martin Logans from Crutchfield were towers and they cost me $10 each to ship back to them.

I bought all my few speakers pairs on many faith reviews before buying ... I could not listen to them...

it is no problem to buy good speakers this way today...

The real problem is what speakers to buy with no acoustic dedicated room or what speakers to buy with as goal a dedicated acoustic room...

And even before the acoustic question what are the room dimension and the speakers characteristic...

Buying without listenings is way less a problem than buying without paying any attention to  any acoustic basics...

My fist speakers were the Tannoy concentric dual gold... Astoundingly good speakers... Believe it or not i NEVER listen to them in 45 years...Why? Because i learn acoustic AFTER selling them...I never hear them at their optimal level.... Alas!

Buying without listening them before was not the problem... Never listening to them in a good acoustically controlled room for them was the problem...

Order some 43-year-old speakers from Reverb dot com.  That sounds safe doesn't it? Hmmm, maybe not.