The simplest approach is to replicate your LUT workflow, specifying the colour space that the LUT is to be applied in to your VFX vendor. If you are grading in ACEScc, you supply a LUT which is your grade only (no IDT, ODT or conversion to/from ACEScc) and if your VFX vendor applies that LUT in ACEScc, with the same ODT you used, then they will see the same thing you did. And if their monitors are different to yours (perhaps sRGB instead of Rec.709) they can just use the appropriate ODT.
If you grade in ACEScct (I would personally recommend you try that) you need to ensure the VFX vendor is using a system which can support ACEScct (the ACES 1.0.3 OCIO config is now available, so systems, such as Nuke, which use OCIO can work in ACEScct). The OCIO File Transform node in Nuke allows you to select the colour space the LUT is applied in.
You should not use a straight cube LUT in ACEScg (or any other linear space). A shaper LUT or mathematical pre-transform is needed to map the input to a suitable mesh spacing. The Academy defines a “Common LUT Format” which is a more flexible LUT format, and can include input and output 1D transforms, 3x3 matrices, ASC CDL as well as cubes. Currently though, that is not generally supported by grading or compositing systems, so is a long term aim, rather than a current practical solution, IMHO.
You may want to read this article on Mixing Light, which explains the VFX workflow for ACES.
One issue you may encounter, and which is mentioned in the article, is that Resolve bakes the RRT and ODT into exported LUTs. Even if you select “No ODT” a transform back to ACES 2065-1 gets baked in. You can counter this by adding an ACES 2065-1 to ACEScc transform to the end of the grade (to invert the ACEScc to ACES 2065-1 transform which will be applied) before exporting your LUT. Pardon the self-promotion, but it may be of interest that I sell a set of ACES DCTL transform files, which can do this.
In terms of specifying to vendors, it is probably safest to specify your ACES version, while things are still changing, and older ACES version my be in circulation. In the long term it should hopefully not be. The RRT is the same in 1.0, 1.0.2 and 1.0.3, so the “look” of ACES doesn’t change.