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The problem with planting trees in boulevards or in parking lot islands is that they cement and asphalt don’t allow a lot of water to filter through to the roots. They might be fine for a little while, you might be able to nurse them along if you find a way to water them. But ultimately, they will all die off earlier than they should.
Bradford pears were used a lot in my area, but were ultimately invasive. I think putting more native shrubs or bushes might help some since their drip like can be kept smaller than a tree’s.
It’s a problem I have to deal with regularly at work. So many parking lots had low canopy trees that just all died off at about the same time due to being in parking islands.