All three of the devices you mentioned support USB-C PD (power delivery). So they should all be able to take advantage of the faster charging speed offered by the 30W adapter. As a side note, the 30W adapter actually offers 4 different charging modes (different voltage and current combos). One of these is roughly equivalent to the 10W charging brick from older iPad models. So you can plug in any iDevice without any ill effects. Older iPhones and iPads will just utilize the slower charging speed instead.