Application to be installed on a Surface Pro(3+)

We have built a working MSI/application for desktop . The client is requesting feasibility to install on a few Surface Pro (3+) devices and I'm not knowledgeable about how this may be different. We can create appx, but we really want to have to avoid the store. Must we install through the store.? We also don't have or intend a MDM solution as we are an outside contractor and won't have access to this sort of thing. Is side loading the only option? Or is there a better approach?

For the iOS devices we can use enterprise account and install by a single link to our servers by passing store and mdm , just a link. Is there something similar for windows?

Thanks

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