Ketan, you are confused because you are listening to ALL the advice. Your job is to collect advice from BP members, and decide which advice is credible, and which advice makes sense for you. Let's talk about your 5 proposed options, one at a time:
1. Leave it as-is. (ie. rentals are in my name)
This is very unwise, since you have opened yourself up to personal liability for all 4 of your rentals! If one of the 4 rentals sues you, any judgement could attach to any (or all) of the other 3 rentals as well as your personal assets (your home, your vehicles, etc.) This is a business; you need to start treating it like one.
2. Add an umbrella insurance policy for my 4 rental properties
Every property should be insured, and you should have an umbrella policy to cover as much as possible, including acts of fraud, negligence, and illegal actions. (if you can find such a policy) Insurance is a safety net, but it won't stop you from falling! (don't rely solely on insurance.)
3. Deed my 4 properties to 4 land trusts (one for each property). Create 4 LLC's (one for each property) and add each LLC as a beneficiary to the corresponding land trust. Finally, create a lien(HELOC) through another LLC to strip the equity I have accumulated so far.
Why would you want 4 land trusts? Land trusts are for estate planning (and anonymity) and offer zero liability protection. (There's also the DOS clause to consider when doing this.) HELOC is not available once you put these in an LLC.
4. Same as #3. However, create only 1 LLC for all 4 land trusts. And add this LLC as a beneficiary to each land trusts.
As I explained above, land trusts do nothing for you, and can cost $500+ each to create. Having one LLC for all 4 properties will separate you personally from the 4 properties, but it will not protect all 4 properties from each other, since they all have same owner.
5. Is there another way to achieve liability protection/estate plan and minimize tax liability?
Yes: One LLC for each property with a Pour Over Trust owning the four LLCs. Ideally, I would complicate this by advising you to have the four LLCs (called operating companies) held/owned by a holding company (also an LLC) and the holding company would then be owned by the trust. Regarding tax liability: with this plan, you have already minimized your tax liability by creating a separate entity (the LLC) for your passive income, and by using the buy & hold strategy vs fix & flip (which is earned income, with FICA tax.)
Also worth noting: based on your goals, you will need at least 2 attorneys (a real estate attorney and an estate planning attorney) as well as an accountant.
I hope this is helpful, but we are way off topic now. This thread was supposed to be about "How to identify a good attorney to work with", which no one has yet to offer up an solution. I am very interested in the answer to that question.