Veering slightly off the original topic, in my experience with sub-100mph designs (and faster is only more tricky), laminar flow is exceptionally hard to maintain on a ground vehicle particularly towards the rear. Even with the most polished, smooth, shiny body, you still have to consider that any disturbance from the forebody is going to transition the flow, be it from a bolt or a non-flush join or any angle that produces any kind of vortex. Then factor in vibrations, dirt/dust/salt/sand, etc. and I'd say realistically you're only going to stay laminar for a short run at the front and you are unlikely to get it back later.
However, I think that's not what this conversation was about - a lot of confusion can arise about what people mean when they say laminar though, as a lot of designers just mean "smooth", which often then translates to attached (and I believe this thread is about flow staying attached rather than laminar). You can have separated laminar flow, same as you can have smooth attached turbulent flow. Laminar flow next to the body is worth chasing if the rest of a design is great, as any well-designed streamlined bodywork would be looking at maybe 70% more of the drag just coming from skin friction, but like I said, in practice it can be very hard to achieve, and it is almost never determined accurately in real-world tests even if a very clean, low turbulence wind tunnel said it would feature heavily. Working to keep flow attached as long as possible is way more bang for your buck, and if you want to try a tighter angle, then you definitely want the flow to be turbulent next to the surface as it'll stay attached for longer.
