None of the options commonly available appealed to me. I didn't like the idea of a cup holder being attached to the air grill, just added to dash clutter. Thought the type that hang from the door/window edge would be too close for comfort as I drive and would be awkward to get the cup. Did think the type that wedge between the passenger seat and gear stick console might be an option but not great for my frequent front seat passengers. Also this type had two cup holders and other space so felt it would just accumulate bits over time!
Sitting in the driver seat I wanted somewhere I could hold the cup that was in easy reach so I don't have to stretch yet not interfering with any other part of the car. The ideal location for me was to hang it from the drivers door pocket!

This worked great but does have a flaw in that I occasionally would hit the holder with my foot getting in/out of the car. Eventually one of these 'kicks' cracked the holder. Time for a rethink!

A further visit to Halfords and I found the answer with this 'soft' drink holder. This is a lot more forgiving of the occasional kick!

As for that restricted cup space in front of the gear stick I found a better use for it. I always like to have a pen to hand without having to root around the glove compartment or in the door pocket. So using one of the kids paint pots I have the perfect holder for a few pens!

I'd be interested in seeing a few pics of how others have solved the coffee up challenge in their Mégane!!