US Bond ETFs for foreigners

Hi, with the weakening of USD, I have accumulated some USD in the past few weeks and am looking for ETFs to store this money with 100% liquidity and good price stability/predictability.

Background:

1. I am a non-US person
2. I pay 30% withholding tax on dividend
3. I pay 0% capital gain tax
4. My brokerage doesn't pay interest on idle money
5. My bank offers fixed deposit at around 3% p.a. interest with 1-month lock-in

I chanced upon some mentions of Bond ETFs like FLOT, SGOV, BIL/S, CLTL etc. I look at their monthly price movement and they seem very predictable, e.g. a drop on ex-div date, then gradually go up over the month. This may suit my needs well — I will buy on ex-div and sell on eve of ex-div to avoid withholding tax, this gives me 100% liquidity, capital protection and a bit of interest from the idle money.

Currently these Bond ETFs are paying around 2%, will they increase in coming months since the treasury yields are already close to 4%?

Before I do it, is there anything else that I may have overlooked? Thanks!