Conformers module for interfacial system

Hello,

I'm curious about whether or not it is possible to use the "Conformers" module to calculate molecular conformations on a substrate. I have constructed a non-periodic boron nitride substrate and optimized a geometry for an alkane on the surface. However, when I run the Conformer calculation, it specifies that it can only be performed on a single molecule. I guess my question is, can I specify that the calculation only consider motion in the alkane, but retain the binding potential that exists from the substrate?