It seems that you need to switch between your MacBook Pro and LG Smart TV. Normally, you can format the NTFS Seagate and WD drive into exFAT to solve this problem, however, your LG TV does not support exFAT. Just like what you've mentioned, your best option now to read and write the Seagate and WD NTFS drive on Mac is using a third-party NTFS driver.
There are many NTFS for Mac free programs in the market, such as Mounty for NTFS, NTFS-3G, FUSE for macOS, and SL-NTFS. However, these completely free NTFS drivers almost have a slow write speed and also require familiarity with Xcode and command lines. Thus, a free NTFS for Mac software could not be your best choice here.
Here I'd like to recommend you a commercial NTFS for Mac software with a relatively low price - iBoysoft NTFS for Mac to help you enable NTFS read-write on Mac. iBoysoft NTFS for Mac app is trustworthy and easy to use. To solve your Seagate and WD external hard drive read-only issue on Mac, simply do the following:
Step 1: Connect your Seagate or WD external hard drive to your MacBook Pro.
Step 2: Free download iBoysoft NTFS for Mac on the official website of iBoysoft or in the Apple App Store.
Step 3: Double-click the box in the middle of the pop-up named Installer.
Step 4: Click Continue Installation. If necessary, you'll be asked to enable System Extensions to gain full disk access.
Step 5: Launch iBoysoft NTFS for Mac software, your Seagate/WD drive should be mounted successfully, and you can access the NTFS disk on Mac and read/write NTFS files.