We could house all the immigrants that arrive for the next ten years on about 1% of the land taken up by golf courses in the UK. It really isn't a huge issue.
The problems of packing people off to hotels is mostly linked with rules about not working, and the mad times it takes to deal with decisions.
As for the money? As above, we're spending it on a system that doesn't work. How do you think any schools or hospitals get built? Because people work, and they grow the economy, and there's more money to build these things.
We're an island and, even with all the fuss over boats, it's pretty easy for us to limit the numbers to a fraction of a percent of the overall population. We'll never truly be overwhelmed in the way that countries on the western edges of Europe could be.
We should make decisions quickly, have immigration rules that allow people to work, even some economic migrants (have a look in the news for just how many businesses are complaining that they can't get staff after Brexit/Covid), and stop worrying. A few tens of thousands of people coming to the UK each year, particularly young people who have the energy and resourcefulness to get here from countries thousands of miles away, is never going to be a real issue, unless we make it into one.