Cost seg - DIY for smaller properties? Worth it on smaller properties?

For 2 properties purchased in Texas - $450k and $350k value 4 and 2 unit duplex.

Is it worth it to get a cost seg / bonus depreciation when they're this small.

(I heard that you can get anywhere from approximately 20% of the 'bonus depreciation' in first 1-2 years. I'm sure this varies by building type and location anyone have a chart or more info on this)

So if the building value of these are about 600k then I'd be able to ' bonus dep' about ($600k x 20%=120k)

$120k as upfront bonus dep this year right? I think that would be worth spending like $4-7k on the studies (for 2 small properties)