No this is generally not required. Where ½ in. thick or thicker building panels connect in angular designs, except at 90 Degree angles, the panel edges must be shaped to conform with the angular design, before they are connected.
Provided the bench is made of a wedi panel offering sufficient thickness (2 in. wedi Building panel), a router can be used to create channels for the tubes. These are being inserted and covered with thinset mortar and wedi Subliner Dry in a shower, or wedi mesh tape in a dry or only moderately wet area, where this quantity of thinset used to fill and cover the tubes channels, can dry out faster.
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