Used to lay the wetpour granules when I worked on the playground maintenance team. You mix it with some resin then pour it in wet and use a trowel to get an even surface. Small areas are easy, big ones you need to take your time. Decent edgings are required we used pre cast concrete edgings but you could probably get away with timber as long as it has been treated to make it water proof.
Moss will grow on it in the shade and although it will drain through to the substrate (lay it on compacted MOT Type 1 or similar) you need to avoid dips and hollows when you’re laying it.
The mulch looks very similar but may be easier to lay.
Alternatively just call someone like http://www.rtcsafety.co.uk/rubber-mulch/ and get them to install it. Prices are similar to laying tarmac.
Bark mulch is much cheaper and easier to install but will attract the local fauna. Budget for topping it up regularly.
*Edited as I mixed up the wetpour with the mulch