The plan was to find landlords for the homeless who quality for rental vouchers and to give those tenants support while they stabilized themselves. While that sounded good on paper and drew wide support from metro-area governments and advocates, fewer than 50 housing units have actually gone to participants in the program, illustrating the persistent difficulty of getting people off the streets when the cost to put a roof over their heads remains so high. However, backers of that program, Landlords Opening Doors, said they knew they faced an uphill battle and aren’t giving up. “Everybody is real supportive and interested to see this campaign do well.