I mounted my display behind the speaker panel. I used this one:
https://www.amazon.co.uk/dp/B07CPBCZHB
Do you see the two tabs at the bottom, with screw holes? Those neatly
locate into existing slots in the console top panel (no screws needed),
supporting and positioning the display. Other than that, the display is
held in place by friction. I replaced the standoffs used between the
front and rear panels by 20mm ones, which avoided the display having a
top-to-bottom slant, and attached small self-adhesive rubber feet (the
dome kind) to the back of the aluminium strip, as bumpers for the top
of the display panel to rest against. Attaching the HDMI cable was
quite tight, and using a right-angled male-to-female HDMI adapter
helped (the kind that turns sideways, rather than up or down, if you
see what I mean).
Locating the display behind the panel like this limits the usable
display area, but on the other hand it's less visually obtrusive than
attaching it to the front. It's an aesthetic choice, so there's no
objectively wrong or right way to do it. And of course you can do
without a display entirely, if you so choose.