I just did a pre-emptive strike on my engine subframe bolts to ensure they were removable without causing issues with the welded nuts. (I know, I know, don’t fix something that is not broken) I followed Billman’s advice and removed one at a time, cleaned it, added anti seize and re-torqued. I was pretty happy how they came out but I went through some gyrations getting my angles just right under the car so I could smoothly arrive at the proper torque values. All my alignment holes were perfectly aligned and I cannot imagine that subframe coming out of position without a major impact crash.