I'd worry about getting comfortable more than a racing position.
Like a trailer, the trike wheels will hang out a bit wider than you are used to.
I tend to ride to the right, and picked up one or two flats with that right tire just a bit more in the debris than I would normally ride. Plus, if there was a pothole, or debris on the road, I could split it between the two side tires, but that third tire would always go bumping over the top.
You will probably want to learn to steer around/through stuff, rather than standing up and moving the trike by hand. Narrow curb cuts? Do the best you can, or perhaps there is a driveway you can hit. Bollards?