You can arbitrarily allocate ownership % any way you want on the purchase. 

RUBS is a method used to allocate utility costs in multifamily residential properties when there aren't separate meters. 

After you eliminate all personal debt besides your mortgage & max out retirement accounts & have a healthy savings account, you need to set aside downpayment + reserves to buy 1 house every 2-3 years and allocate a % to equities & private debt offerings as the rest.

Having met with some of the largest BFR capital allocators and aggregators in March in Nashville and last week in Miami, I can tell you many people are doing (and speaking of) BFR differently. 

One variable you might consider is allocating more to the down payment, perhaps up to 30%.

It sounds like your salary, and your expected bonus, will be the foundation for your future investments, so make sure you calculate how much you can comfortably allocate towards real estate investments without straining your finances.

The way I look at things is that all capital allocators are spread traders underneath it all, maybe real estate more so because of our common sources of funds. 

I stressed about whose weddings I'd miss cause of funds, and allocating time.

For borrowers with higher reserve allocations, they could consider making a cash offer and coordinating a cash out refinance at a later date.

Often direct mortgage banks or lenders have an asset allocation monthly, quarterly or seasonally that they utilize to fund loans that are outside of 'the box' or need specific terms or conditions to qualify.